/Engine/Source/Editor/UnrealEd/Classes/Editor/EditorEngine.h
Queries for a list of assets that are soft referenced by the current editor selection (actors, surfaces, etc.)
void GetSoftReferencedAssetsForEditorSelection ( [TArray](API\Runtime\Core\Containers\TArray)< [FSoftObjectPath](API\Runtime\CoreUObject\UObject\FSoftObjectPath) > & SoftObjects )